Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::storagecontrol_v2::StorageControlClient(
google::cloud::storagecontrol_v2::MakeStorageControlConnection(
options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-14 UTC."],[[["This webpage provides documentation for different versions of the Storage Control API, ranging from version 2.21.0 up to the latest release candidate, 2.37.0-rc."],["The content describes how to override the default authentication credentials used by the client libraries for interacting with Google Cloud Services, which usually default to Application Default Credentials."],["Users can override these default credentials by providing a `UnifiedCredentialsOption`, which involves loading a service account key file, as demonstrated in the example code."],["For best practices regarding service account keys, users should consult the guide provided."],["There are also additional resources found within the \"See Also\" section regarding authentication components and the factory functions for `google::cloud::Credentials` objects."]]],[]]